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Seems that you have even reinstalled Office 2013 in that machine but no avail. Have you tried to fix d3d11.dll. Copy the file from a health system and run cmd as administrator to type "regsvr32 path\d3d11.dll".

Run "sfc /scannow" or "chkdsk /f" if necessary. (administrator required)

If the issue still persists, I'm afraid we have to reinstall OS to fix everything. Thanks.

Cheers,
Tony Chen
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Just checked system restore and there were two restore points labelled "Installed DirectX" a week or so ago. I've rolled back previous to them and results are good so far.

The question is why a 3rd party app was able to install a version of DirectX that interferes with Office. I suspect that it was games run via Steam that did this. I will keep this thread updated but I think Microsoft have a larger problem here in keeping
these libraries from being touched by the DirectX redistributables that ship with games.

The problem usually is with the drivers or 3rd party software. For instance, I had the same problem with outlook 2013. I tried to reinstall DX and VGA drivers, but it didn't help. Another thing I did, turned off hardware acceleration for whole office
apps(file->options->advanced->disable hardware acceleration...) and still same problem. Even reinstalled re-installed office, but problem still persisted, until I started to "dig deeper"...

I've noticed that my 3rd party software(FRAPS) started to act strangely after I started one of the office apps. So decided to close FRAPS and some desktop gadgets and it WORKED! Outlook is now working properly and not crashing because of that d3d11.dll.
That was so unexpected.

So in conclusion, if you experiencing outlook or any other office app crashes, check your VGA drivers and 3rd party software like FRAPS or any OSD gpu/cpu monitor...

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